There have been countless people that have started big motor conversions: V8, twin turbo, twin charged, etc, etc, and I think one or two out of hundreds have "somewhat" worked. You should talk to VRP about engine weight and measurements. Also, about ECU control units.

You actually could do this pretty cheap if you sourced a motor out of a wrecked AMG, and a used SRT. I bet you could do it for 30k.